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South Korean vehicles, left, return from the North Korean city of Kaesong at Unification Bridge in Paju, South Korea, near the border village of Panmunjom, Saturday, April 6, 2013. More South Koreans on Saturday began to leave North Korea and the factory park where they work, four days after Pyongyang closed the border to people and goods. The letters read " Unification Gate." (AP Photo/AhnnYoung-joon)
/ AP